RSVD Pin Connections on Nvidia Jetson Orin: Usage and Best Practices

Issue Overview

Users of the Nvidia Jetson Orin series are encountering uncertainty regarding the proper handling of pins 88, 90, and 92, which are marked as "RSVD" (reserved) on the device. The main concern is whether these pins should be connected to specific voltage levels (GND, 1.8V, 3.3V) or left unconnected. This issue arises during the hardware integration or design phase when working with Jetson Orin boards, potentially affecting system design and functionality if not addressed correctly.

Possible Causes

1. Lack of Clear Documentation: The ambiguity may stem from insufficient or unclear documentation provided by Nvidia regarding the purpose and proper handling of reserved pins.

2. Misinterpretation of Pin Designations: Users might misunderstand the meaning of "RSVD" pins, leading to incorrect assumptions about their required connections.

3. Varying Practices in Electronics Design: Different approaches to handling reserved pins in other hardware platforms might cause confusion when working with the Jetson Orin series.

4. Concern for System Stability: Users may worry that leaving pins floating could lead to system instability or electromagnetic interference issues.

Troubleshooting Steps, Solutions & Fixes

1. Understand the Meaning of RSVD Pins:

   • RSVD stands for "reserved" in the context of pin designations.
   • These pins are intentionally left unused by the manufacturer for potential future use or internal testing purposes.

2. Correct Handling of RSVD Pins:

   • The recommended approach is to leave RSVD pins floating (unconnected).
   • Do not tie these pins to any voltage level (GND, 1.8V, 3.3V, etc.).

3. Best Practices for Hardware Design:

   • When designing PCBs or integrating the Jetson Orin into a system, ensure that pins 88, 90, and 92 are not connected to any circuitry.
   • If using a socket or connector for the Jetson Orin, make sure these pins are not routed to any other components.

4. Documentation and Support:

   • Always refer to the latest official Nvidia Jetson Orin documentation for the most up-to-date information on pin configurations.
   • If in doubt, contact Nvidia support or consult the Jetson developer forums for clarification on specific hardware design questions.

5. Future-Proofing Designs:

   • Be aware that the status of reserved pins may change in future hardware revisions or software updates.
   • Design your systems with flexibility in mind, allowing for potential changes in pin usage without major redesigns.

6. Electromagnetic Considerations:

   • While leaving pins floating is the correct approach, ensure proper EMI/EMC design practices are followed in your overall system design to minimize any potential interference issues.

By following these guidelines, users can ensure proper handling of the RSVD pins on the Nvidia Jetson Orin series, maintaining compatibility with current and potential future specifications while avoiding any unintended consequences from incorrect pin connections.